On the performance of a hybrid process to mineralize the herbicide tebuthiuron using a DSA (R) anode and UVC light: A mechanistic study
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.apcatb.2016.07.003 http://hdl.handle.net/11449/161998 |
Resumo: | A hybrid electrochemical and photochemical (HEP) process was used to oxidize and mineralize the herbicide tebuthiuron (TBT), which is a potential contaminant of ground water, using a DSA (R) anode and UVC light. The electrochemical and photochemical experiments were carried out in flow reactors and the investigated variables were: i) power of the Hg lamp (5, 9, 80, and 125 W), ii) solution pH (3, 7, 11, and no control), iii) NaCl concentration (0, 1, 2, and 4 g L-1), and iv) electric current density (10, 20, and 30 mA cm(-2)). The performance of the oxidation and mineralization process of TBT and its intermediates was assessed by high performance liquid chromatography coupled to mass spectrometry and total organic carbon analyses. The use of a 9 W Hg lamp led to complete oxidation and mineralization of TBT, and its intermediate compounds, from acidic to neutral solutions, independently of the applied electric current density, and with increasing NaCl concentration. High CO2 conversions were obtained using the HEP process, as the generated intermediates (including an organochlorine) were completely eliminated. TBT removal rates similar to those of an electrochemical experiment using a boron-doped diamond anode were attained using the HEP process, but with higher energy consumption; however, chlorinated carboxylic acids were no longer present in the final treatment stages. The HEP process could be regarded as an advanced oxidation process, being an interesting option to treat effluents contaminated with organics if a proper optimization of the UVC lamp is done. (C) 2016 Elsevier B.V. All rights reserved. |
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On the performance of a hybrid process to mineralize the herbicide tebuthiuron using a DSA (R) anode and UVC light: A mechanistic studyMediated oxidationSynergistic effectSynthetic organic pollutantsOrganochlorine compoundsMixed oxide anodeA hybrid electrochemical and photochemical (HEP) process was used to oxidize and mineralize the herbicide tebuthiuron (TBT), which is a potential contaminant of ground water, using a DSA (R) anode and UVC light. The electrochemical and photochemical experiments were carried out in flow reactors and the investigated variables were: i) power of the Hg lamp (5, 9, 80, and 125 W), ii) solution pH (3, 7, 11, and no control), iii) NaCl concentration (0, 1, 2, and 4 g L-1), and iv) electric current density (10, 20, and 30 mA cm(-2)). The performance of the oxidation and mineralization process of TBT and its intermediates was assessed by high performance liquid chromatography coupled to mass spectrometry and total organic carbon analyses. The use of a 9 W Hg lamp led to complete oxidation and mineralization of TBT, and its intermediate compounds, from acidic to neutral solutions, independently of the applied electric current density, and with increasing NaCl concentration. High CO2 conversions were obtained using the HEP process, as the generated intermediates (including an organochlorine) were completely eliminated. TBT removal rates similar to those of an electrochemical experiment using a boron-doped diamond anode were attained using the HEP process, but with higher energy consumption; however, chlorinated carboxylic acids were no longer present in the final treatment stages. The HEP process could be regarded as an advanced oxidation process, being an interesting option to treat effluents contaminated with organics if a proper optimization of the UVC lamp is done. (C) 2016 Elsevier B.V. All rights reserved.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Univ Fed Sao Carlos, Dept Quim, CP 676, BR-13560970 Sao Carlos, SP, BrazilUniv Estadual Paulista, Dept Quim Analit, Inst Quim Araraquara, BR-14800900 Araraquara, SP, BrazilUniv Estadual Paulista, Dept Quim Analit, Inst Quim Araraquara, BR-14800900 Araraquara, SP, BrazilElsevier B.V.Universidade Federal de São Carlos (UFSCar)Universidade Estadual Paulista (Unesp)Montes, Isaac J. S.Silva, Bianca F. [UNESP]Aquino, Jose M.2018-11-26T17:06:28Z2018-11-26T17:06:28Z2017-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article237-245application/pdfhttp://dx.doi.org/10.1016/j.apcatb.2016.07.003Applied Catalysis B-environmental. Amsterdam: Elsevier Science Bv, v. 200, p. 237-245, 2017.0926-3373http://hdl.handle.net/11449/16199810.1016/j.apcatb.2016.07.003WOS:000384775600025WOS000384775600025.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengApplied Catalysis B-environmental3,152info:eu-repo/semantics/openAccess2023-10-31T06:10:09Zoai:repositorio.unesp.br:11449/161998Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-10-31T06:10:09Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
On the performance of a hybrid process to mineralize the herbicide tebuthiuron using a DSA (R) anode and UVC light: A mechanistic study |
title |
On the performance of a hybrid process to mineralize the herbicide tebuthiuron using a DSA (R) anode and UVC light: A mechanistic study |
spellingShingle |
On the performance of a hybrid process to mineralize the herbicide tebuthiuron using a DSA (R) anode and UVC light: A mechanistic study Montes, Isaac J. S. Mediated oxidation Synergistic effect Synthetic organic pollutants Organochlorine compounds Mixed oxide anode |
title_short |
On the performance of a hybrid process to mineralize the herbicide tebuthiuron using a DSA (R) anode and UVC light: A mechanistic study |
title_full |
On the performance of a hybrid process to mineralize the herbicide tebuthiuron using a DSA (R) anode and UVC light: A mechanistic study |
title_fullStr |
On the performance of a hybrid process to mineralize the herbicide tebuthiuron using a DSA (R) anode and UVC light: A mechanistic study |
title_full_unstemmed |
On the performance of a hybrid process to mineralize the herbicide tebuthiuron using a DSA (R) anode and UVC light: A mechanistic study |
title_sort |
On the performance of a hybrid process to mineralize the herbicide tebuthiuron using a DSA (R) anode and UVC light: A mechanistic study |
author |
Montes, Isaac J. S. |
author_facet |
Montes, Isaac J. S. Silva, Bianca F. [UNESP] Aquino, Jose M. |
author_role |
author |
author2 |
Silva, Bianca F. [UNESP] Aquino, Jose M. |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade Federal de São Carlos (UFSCar) Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Montes, Isaac J. S. Silva, Bianca F. [UNESP] Aquino, Jose M. |
dc.subject.por.fl_str_mv |
Mediated oxidation Synergistic effect Synthetic organic pollutants Organochlorine compounds Mixed oxide anode |
topic |
Mediated oxidation Synergistic effect Synthetic organic pollutants Organochlorine compounds Mixed oxide anode |
description |
A hybrid electrochemical and photochemical (HEP) process was used to oxidize and mineralize the herbicide tebuthiuron (TBT), which is a potential contaminant of ground water, using a DSA (R) anode and UVC light. The electrochemical and photochemical experiments were carried out in flow reactors and the investigated variables were: i) power of the Hg lamp (5, 9, 80, and 125 W), ii) solution pH (3, 7, 11, and no control), iii) NaCl concentration (0, 1, 2, and 4 g L-1), and iv) electric current density (10, 20, and 30 mA cm(-2)). The performance of the oxidation and mineralization process of TBT and its intermediates was assessed by high performance liquid chromatography coupled to mass spectrometry and total organic carbon analyses. The use of a 9 W Hg lamp led to complete oxidation and mineralization of TBT, and its intermediate compounds, from acidic to neutral solutions, independently of the applied electric current density, and with increasing NaCl concentration. High CO2 conversions were obtained using the HEP process, as the generated intermediates (including an organochlorine) were completely eliminated. TBT removal rates similar to those of an electrochemical experiment using a boron-doped diamond anode were attained using the HEP process, but with higher energy consumption; however, chlorinated carboxylic acids were no longer present in the final treatment stages. The HEP process could be regarded as an advanced oxidation process, being an interesting option to treat effluents contaminated with organics if a proper optimization of the UVC lamp is done. (C) 2016 Elsevier B.V. All rights reserved. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-01-01 2018-11-26T17:06:28Z 2018-11-26T17:06:28Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.apcatb.2016.07.003 Applied Catalysis B-environmental. Amsterdam: Elsevier Science Bv, v. 200, p. 237-245, 2017. 0926-3373 http://hdl.handle.net/11449/161998 10.1016/j.apcatb.2016.07.003 WOS:000384775600025 WOS000384775600025.pdf |
url |
http://dx.doi.org/10.1016/j.apcatb.2016.07.003 http://hdl.handle.net/11449/161998 |
identifier_str_mv |
Applied Catalysis B-environmental. Amsterdam: Elsevier Science Bv, v. 200, p. 237-245, 2017. 0926-3373 10.1016/j.apcatb.2016.07.003 WOS:000384775600025 WOS000384775600025.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Applied Catalysis B-environmental 3,152 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
237-245 application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier B.V. |
publisher.none.fl_str_mv |
Elsevier B.V. |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1799964768873742336 |